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Metamaterials for Enhanced Optical Responses and their Application to Active Control of Terahertz Waves
Author(s) -
Lee Seojoo,
Baek Soojeong,
Kim TeunTeun,
Cho Hyukjoon,
Lee Sangha,
Kang JiHun,
Min Bumki
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202000250
Subject(s) - metamaterial , terahertz radiation , materials science , optoelectronics , refractive index , split ring resonator , photonic metamaterial , terahertz metamaterials , context (archaeology) , optics , transformation optics , optical materials , physics , far infrared laser , laser , paleontology , biology
Metamaterials, artificially constructed structures that mimic lattices in natural materials, have made numerous contributions to the development of unconventional optical devices. With an increasing demand for more diverse functionalities, terahertz (THz) metamaterials are also expanding their domain, from the realm of mere passive devices to the broader area where functionalized active THz devices are particularly required. A brief review on THz metamaterials is given with a focus on research conducted in the authors' group. The first part is centered on enhanced THz optical responses from tightly coupled meta‐atom structures, such as high refractive index, enhanced optical activity, anomalous wavelength scaling, large phase retardation, and nondispersive polarization rotation. Next, electrically gated graphene metamaterials are reviewed with an emphasis on the functionalization of enhanced THz optical responses. Finally, the linear frequency conversion of THz waves in a rapidly time‐variant THz metamaterial is briefly discussed in the more general context of spatiotemporal control of light.